JOURNAL OF MOLECULAR LIQUIDS
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2018
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IF 4.513
Pengshuai Zhang,Rui Zhao,Chi Zhang,Yameng Wan,Tao Li,Baozeng Ren
The solubility of cyromazine in three binary solvent mixtures (acetic acid + water, propanoic acid + water, ethylene glycol + water) were measured by a gravimetric method from 278.15 K to 333.15 K under atmospheric pressure. The experimental results reveal that the mole fraction solubility of cyromazine increased with the increase of temperature in the three solvents. The Apelblat equation, the λh equation, the general single model ( GSM ) equation and the modified Jouyban-Acree model equation were all applied to correlate the experimental solubility of cyromazine well. Moreover, the dissolution thermodynamic properties: Δ sol H 0 (the apparent standard enthalpy change), Δ sol S 0 (the apparent standard entropy change), Δ sol G 0 (the apparent standard Gibbs energy change), ζ H (relative contribution of enthalpy) and ζ TS (relative contribution of entropy) of the dissolution of cyromazine in the selected solvents were calculated. The positive values of Δ sol H 0 , Δ sol G 0 , ζ H ≥ 0.5984 and ζ TS ≤ 0.4016 indicated that the dissolution of cyromazine in the three binary solvents was enthalpy-driving and endothermic process. The experimental solubility of cyromazine in this work can provide good guidance and fundamental data for the crystallization, purification and application of cyromazine.
研究领域:
化学工程
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药物化学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY
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2017
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IF 4.52
Rui-rui Cao,Xuan Li,Sai Chen,Hao-ran Yuan,Xing-xiang Zhang
A series of a novel shape-stabilized phase change material of poly(hexadecyl acrylate)/graphene oxide (PHDA/GO) nanocomposite was fabricated by in situ free radical polymerization . The fabricated PHDA/GO nanocomposites mainly contain a poly(hexadecyl acrylate)-grated-graphene oxide (PHDA- g -GO) solid-solid phase change material (SSPCM) and a PHDA solid-liquid phase change material (SLPCM). The PHDA- g -GO SSPCM plays two roles in the PHDA/GO nanocomposites: as the supporting material and as a phase change working substance. The effects of GO loading on the crystalline properties and the phase change properties of the PHDA/GO nanocomposites were investigated. The results indicate that the grain size of the PHDA/GO nanocomposites increases with GO loading. The nanocomposites have high thermal enthalpies, and their enthalpy efficiencies are significantly higher than those of traditional shape-stabilized PCMs (TPCMs) because of the synergistic phase change effect of PHDA- g -GO and PHDA. The number of crystalline CH 2 groups, including the terminal methyl, in the alkyl side chain of PHDA increases from 6.42 to 8.82. Moreover, the FTIR spectra and DSC curves of the PHDA/GO nanocomposites after thermal cycles are nearly the same as those of the original specimens , which indicate that the nanocomposites have excellent thermal reliability and reusability . This study not only provides a kind of novel shape-stabilized PCM with a high performance but also proposes a new way to solve the problem of enthalpy decline observed in TPCMs.
研究领域:
材料科学
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能源工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Macromolecular Science Part A-Pure and Applied Chemistry
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2016
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IF 0.963
Xuelin Huang,Jing Guo,Xueyong Gong,Shenglin Li,Yumei Gong,Qingda An,Sen Zhang,Fucheng Guan
Pentaerythritol/butane tetracarboxylic acid/polyethylene glycol (PBPEG) crosslinking copolymers as a novel solid-solid phase change material (SSPCM) were successfully synthesized through the reaction mechanism and conditions of hydroxyl-carboxyl condensation reaction. The composition and chemical structure, crystalline properties, phase change behaviors, thermal reliability and chemical stability of PBPEG crosslinking copolymers were investigated by Fourier transform infrared spectroscopy (FT-IR), wide-angle X-ray diffraction (WAXD), polarization optical microscopy (POM), differential scanning calorimetry (DSC), and thermogravimetry (TGA), respectively. The results show that PBPEG crosslinking copolymers have typical solid-solid phase transition temperatures in the range of 10.31∼53.27°C and high latent heat enthalpy in the range of 89.6∼102.8 J/g, the synthesized SSPCMs have good thermal reliability and chemical stability after 300 thermal cycles, and PBPEG crosslinking copolymers have good thermal stability before 364°C. In summary, the synthesized PBPEG crosslinking copolymers could be potentially used for thermal energy storage.
研究领域:
材料科学
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高分子化学
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热能存储
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相变材料
✓ 已验证
DOI
高影响因子
JOURNAL OF CEREAL SCIENCE
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2021
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IF 3.616
Jinguang Liu,Yuqian Liu,Anqi Wang,Zhen Dai,Rui Wang,Hui Sun,Padraig Strappe,Zhongkai Zhou
Yellowing is associated with the changes in rice quality during storage. This study revealed that the increased yellowness of rice was highly associated with the moisture content of rice during storage. The hysteresis loop formed by sorption and desorption curves showed that the water loss of japonica rice was the largest, suggesting the internal structure of japonica rice was more vulnerable to be damaged. The heat enthalpy of rice increased first, and then decreased during yellowing, indicating the changes in the corresponding rice structure. The changes in the moisture migration were monitored by low-field NMR, and the data showed that the content of tightly bound water decreased during yellowing, and the tightly bound water transferred to higher fluidity in medium moisture content (MMC) and higher moisture content (HMC) sample. The concentration of most esters, ketones and alcohols of rice was increased during yellowing in a lower moisture content (LMC) sample. This study revealed that the yellowing process could inhibit the release of some volatiles for MMC and HMC samples. The increased 1,2-dimethoxy-benzene and phenol in HMC sample during yellowing were the characteristic volatiles for the highest yellowed rice samples. This study may highlight the further understanding of rice yellowing mechanism.
研究领域:
食品科学
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农业工程
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
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2022
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IF 5.532
Ruizhi Xue,Ruirui Huang,Binbin Wu,Ning Li,Qing Chang,Chaorui Xue,Caihong Hao,Huiqi Wang,Jinlong Yang,Shengliang Hu
Interfacial solar driven water evaporation (ISDWE) and photocatalytic pollutant degradation (PPD) have been considered as efficient and green technologies for tackling the water crisis. Here, through hydrothermal treatment of TiH 1.924 /Ti powders, we designed a hybrid material composed of partially oxidized TiH 1.924 and TiO 2 nanosheets with outstanding ISDWE and PPD performances. Titanium suboxides can be formed inside the compound of partially oxidized TiH 1·924 /TiO 2 nanosheet, and induce efficient solar-thermal transformation. Meanwhile, TiO 2 nanosheet is conducive to reducing the water vaporization enthalpy, ensuring adequate water supply, and enlarging the surface area for evaporation. Due to the synergies between partially oxidized TiH 1.924 and TiO 2 nanosheet, the water evaporation rate achieved 1.70 kg m −2 •h −1 under solar radiation of 1.0 kW m −2 , which is higher than most reported titanium compounds. The investigation on the PPD performance showed that the photothermal effect and band alignment collaboratively improved the photodegradation of rhodamine B by partially oxidized TiH 1·924 /TiO 2 nanosheets. The excellent PPD property can promote the long-term ISDWE application of partially oxidized TiH 1·924 /TiO 2 nanosheets by avoiding the dye accumulation. This study may provide valuable information for developing advanced composites, ISDWE and PPD technologies.
研究领域:
环境科学
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材料科学
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纳米技术
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水处理
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
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2024
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IF 8.5
Jiawei Qiao,Zhuo Zhang,Bao Xing,Yongqiang Liang,Min Jia,Junyan Yun,Jiahui Niu,Hai Li,Guixing Ren,Peiyou Qin,Lizhen Zhang
Starch chain-length distributions play a key role in regulating the processing and digestion characteristics of proso millet starch. Waxy proso millet starch has higher endothermic enthalpy (13.06–16.73 J/g) owing to its higher relative crystallinity (27.83%–32.04%), while nonwaxy proso millet starch has lower peak viscosity (1.0630–1.1930 Pa∙s) and stronger viscoelasticity owing to its higher amylose content (21.72%–24.34%). Non-waxy proso millet starch exhibited two different digestion phases and its resistant starch content (18.37%–20.80%) was higher than waxy proso millet starch. Correlation analysis showed proso millet starch with longer amylopectin B1 chains and more amylopectin B2 chains exhibited excellent thermal ability and retrograde resistance, whereas proso millet starch with shorter and more amylose medium/long-chains not only reduced the digestion rate and increased the resistant starch content but also exhibited stronger viscoelasticity and excellent retrogradation properties. These results could provide more insights into efficient utilization of proso millet starch.
研究领域:
食品科学
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淀粉化学
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营养学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）